The switch for the PowerBoost edition should work with your PSU to initiate a shutdown

is this the current powerboost edition board
and if so...
any idea how this should be wired up.....
(if it is,its just the LBO, that is throwing me off)

or this going to be the case for the new revisions....

yeah, i ditched it on my recent build too since it wasn't obvious how to hook it up, but figured the psu battery monitor was good enough, with a tactile switch to the gpio to trigger a safe s/d. it would be nice to have that switch to do the powerdown instead, and save that extra bit.

I think what Veteran is saying, is a way to simplify the below image. Merlin worked out a way to add an ads1105 with your Safe Shutdown board. That way he had batt monitoring and changed the script so the safe shutdown triggered with flipping the switch. I would also be interested in this as it nice to have that shutdown script on demand at the switch (not a separate button/combo of buttons). Ignoring all the other parts of this diagram (helder pcb, screen, sd card), something that incorporates the shutdown pcb, ads and powerboost like this: